Roaster oven



FIG. 1 is a perspective view of a roaster oven showing my new design;

FIG. 2 is a front plan view of the roaster oven shown in FIG. 1;

FIG. 3 is a back plan view of the roaster oven shown in FIG. 1;

FIG. 4 is a left side plan view of the roaster oven shown in FIG. 1;

FIG. 5 is a right side plan view of the roaster oven shown in FIG. 1;

FIG. 6 is a top plan view of the roaster oven shown in FIG. 1; and,

FIG. 7 is a bottom plan view of the roaster oven shown in FIG. 1. 

The ornamental design for a roaster oven, substantially as shown and described. 